Idea of Compare Icon
This icon shows two pieces of paper dog-eared on the top right corner, and slightly overlapping each other. The leftmost page is in the forefront and features an arrow pointing to the right. The page in the background has an arrow facing to the left.
This page shows the different variations of the Compare from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free.